The adsorption of fluor-carbon complexes on GaAs(110) studied by electron energy loss spectroscopy |
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| Institution: | 1. School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;2. Science and Technology on Low-Light-Level Night Vision Laboratory, Xi''an 710065, China;3. School of Communication Engineering, Nanjing Institute of Technology, Nanjing 211167, China;1. School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;2. Science and Technology on Low-Light-Level Night Vision Laboratory, Xi''an 710065, China |
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| Abstract: | The room temperature adsorption of CF3COOH, CH3COOH and CO on cleaved GaAs(110) surfaces has been studied by vibrational electron energy loss spectroscopy (HRELS), second derivative electron energy spectroscopy (ELS) and electron diffraction (LEED). CO does not adsorb on the GaAs surfaces in measurable quantities. Acetic acid CH3COOH is dissociatively adsorbed as an acetate bonded to Ga surface atoms with the split-off hydrogen on As surface atoms. The fluorated acid CF3COOH decomposes via an acetate intermediate CF3COO into active CF3 groups which adsorb on Ga surface atoms. The split-off hydrogen sticks to surface As atoms while the generated CO2 desorbs. The adsorption models are consistent with the LEED c(2×2) superstructure observed after saturated adsorption of both acids. |
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